CN101202584B - Method for allocation of UE specific intermediate code in a time-division synchronization code division multiple access system - Google Patents
Method for allocation of UE specific intermediate code in a time-division synchronization code division multiple access system Download PDFInfo
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- CN101202584B CN101202584B CN2006101651471A CN200610165147A CN101202584B CN 101202584 B CN101202584 B CN 101202584B CN 2006101651471 A CN2006101651471 A CN 2006101651471A CN 200610165147 A CN200610165147 A CN 200610165147A CN 101202584 B CN101202584 B CN 101202584B
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Abstract
The invention proposes a distribution method for a UE specific intermediate code in a TD-SCDMA which includes a step that the system distributes the UE specific intermediate code for a user who is newly accessed in an uplink time slot and/or a downlink time slot; wherein, the step to distribute the UE specific intermediate code further includes: step one, the system calculates the distance between the UE specific intermediate code excursion in each leisure state and the UE specific intermediate code excursion in each occupying state and the distance is the absolute value of the difference between the two UE specific intermediate code excursions; step two, ensuring the minimum distance among the distances between each UE specific intermediate code excursion in leisure state and each UE specific intermediate code excursion in occupying state; step three, finding out the UE specific intermediate code in leisure state corresponding to the minimum distance with the maximum numerical value among all the minimum distances corresponding to all the UE specific intermediate codes in leisure state and distributing the UE specific intermediate code to the newly accessed user.
Description
Technical field
The present invention relates to the tdd communication systems field, the distribution method of Midamble (intermediate code) in particularly a kind of TD-SCDMA (TimeDivision Synchronous CDMA, TD SDMA) communication system.
Background technology
In tdd systems, Midamble (intermediate code) is called training sequence code again, and the centre that it is arranged in burst structure two data fields is used to carry out the maintenance of channel estimating, uplink synchronous and power measurement etc.The Midamble sign indicating number that different user is adopted in the same sub-district, in the same time slot is produced after cyclic shift by a basic Midamble sign indicating number, and main contents of the present invention are exactly the distribution method that is offset hereto.Clearly stipulated three kinds of allocation models of Midamble sign indicating number in the tdd systems in the 3GPP agreement 25.221, be respectively:
UE specific (UE Specific) Midamble pattern: clearly distribute a specific Midamble sign indicating number of upstream or downstream UE by high level;
Acquiescence (Default) Midamble pattern: uplink and downlink Midamble sign indicating number is distributed according to the channel code that is associated by layer 1;
Public (Common) Midamble pattern: descending Midamble sign indicating number is determined according to the quantity of simultaneous channel code in the descending time slot by layer 1.
For stipulated in the specific Midamble sign indicating number allocation model agreement of UE can be with its part as channel resource, by high-rise flexible allocation, and its part as the physical channel configuration is indicated to UE the most at last.The specific Midamble sign indicating number distribution of UE can be placed on the distribution of channel code in the same process, carries out after channel code is distributed.
The specific Midamble sign indicating number allocation model of UE is not to be applicable to all occasions, there is certain service condition in this pattern in descending time slot, therefore before using the specific Midamble sign indicating number allocation model of UE, need following condition is judged, only have ready conditions and satisfy and could use:
1. many UEs use the physical channel of a descending time slot; And
2. all these physical channels have used wave beam forming; And
3. any one in all these physical channels all do not used Closed-Loop Transmit Diversity; Perhaps
4. the PDSCH physical layer signaling based on the Midamble sign indicating number is used.
Summary of the invention
The objective of the invention is to propose the distribution method of the specific intermediate code of UE in a kind of TDS-CDMA system, to avoid the interference between the different user.
For achieving the above object, the present invention proposes the distribution method of the specific intermediate code of UE in a kind of TDS-CDMA system, comprise: described system distributes the step of the specific intermediate code of UE for the new user who inserts at ascending time slot and/or descending time slot, wherein, the step of the specific intermediate code of described distribution UE further comprises:
Step 1, the distance between specific intermediate code skew of each idle condition UE of described system-computed and the specific intermediate code skew of each seizure condition UE, described distance is the absolute value of the difference of two specific intermediate code deviation numbers of UE;
Step 2 determines that the specific intermediate code of each idle condition UE is offset the minimum range in the distance that is offset with the specific intermediate code of each seizure condition UE;
Step 3 in whole minimum range of the specific intermediate code correspondence of all idle condition UE, finds the specific intermediate code of the pairing idle condition UE of minimum range of numerical value maximum, gives the new user who inserts with the specific midamble allocation of described UE.
The distribution method of the specific intermediate code of UE in the above-mentioned TDS-CDMA system wherein, further comprises before the described step 1:
Judge whether the number of users that described ascending time slot and/or descending time slot have carried is equal to or greater than described ascending time slot maximum number of user amount restriction, if, then terminate as described user and distribute the specific intermediate code of described UE, if not, then enter the step of described step 1.
The distribution method of the specific intermediate code of UE in the above-mentioned TDS-CDMA system, wherein, described step 3 further comprises: described system beyond time slot 0 other ascending time slots and/or the dedicated channel of descending time slot be that described user distributes the specific intermediate code of UE.
The distribution method of the specific intermediate code of UE in the above-mentioned TDS-CDMA system, wherein, described step 3 further comprises:
Described system only distributes the step of a specific intermediate code of UE for the new user who inserts at ascending time slot and descending time slot; Perhaps
Described system distributes a specific intermediate code of UE at described ascending time slot for the new user who inserts, and distributes the step of the specific intermediate code of another UE for the new user who inserts at described descending time slot.
The distribution method of the specific intermediate code of UE in the above-mentioned TDS-CDMA system, wherein, described step 3 further comprises:
In identical time slot, described system assignment is given the step of the different specific intermediate code of UE of different user.
The distribution method of the specific intermediate code of UE in the above-mentioned TDS-CDMA system, wherein, described step 3 further comprises:
In identical time slot, when many code channels of CU, described system assignment is given the step of a specific intermediate code of UE of described user.
The distribution method of the specific intermediate code of UE in the above-mentioned TDS-CDMA system, wherein, described step 3 further comprises:
In different time-gap, described system assignment is given same user the step of the specific intermediate code of UE identical or inequality.
The distribution method of the specific intermediate code of UE in the above-mentioned TDS-CDMA system wherein, further comprises before the described step 1:
The state that identifies the specific intermediate code skew of each UE is the idle condition or the step of seizure condition.
In sum, there are not the mapping relations between Midamble sign indicating number skew and channel code in the present invention, but distributes the skew of Midamble sign indicating number according to certain principle according to the time that the user inserts.In order to evade the interference between different user, adopt the user's who makes new access Midamble sign indicating number offset distance to have user Midamble sign indicating number offset distance principle farthest, regardless of user's power difference, all can guarantee the inter-user interference minimum.
Description of drawings
Fig. 1 is the flow chart of the specific Midamble sign indicating number assigning process of tdd communication systems UE of the present invention.
Embodiment
The present invention is directed to the specific Midamble sign indicating number allocation model of tdd systems UE and propose a kind of Midamble code-resource distribution method, under the prerequisite of as far as possible avoiding phase mutual interference between different user, the user is given in the Midamble skew skew farthest that distributes distance to use.Especially at the interference that exists between different user, the distance that can be offset by the Midamble sign indicating number of artificial its use of increase is evaded, and further improves the correctness of channel estimating.
The principle that the specific Midamble sign indicating number of UE distributes is: for identical time slot, the skew of the Midamble sign indicating number of different user is different, during many code channels of same CU, can be it and distributes one or more Midamble sign indicating number skews; For different time-gap, the Midamble sign indicating number of each time slot distribute can be separate also can be interrelated, promptly when the user takies a plurality of time slot simultaneously, each time slot for its distribute identical Midamble sign indicating number be offset can be identical also can difference.
In the present invention, the skew that at first will define certain Midamble sign indicating number skew and be close to about it is called adjacent Midamble sign indicating number skew, and the absolute value that defines the difference of two Midamble sign indicating number deviation numbers is called the distance of Midamble sign indicating number skew, and distance of the big more then two Midamble sign indicating numbers skew of this value is far away more.Intercept because the Midamble sign indicating number is circulation, if therefore K Midamble skew arranged, we think that skew 1 and skew K also are adjacent skew.
Secondly, the present invention has utilized the notion of the distance of putting set.Regard the free time skew as two different set with occupied skew, the Midamble sign indicating number offset distance skew farthest that distributes distance to use will be found the occupied set of distance point farthest in fact exactly in idle offset collection.The distance definition of putting set can be this beeline of being had a few in the set.Therefore at first we need the distance of computation-free offset collection mid point to occupied offset collection, and there is a minimum value and value in each point institute in the occupied set in the promptly idle offset collection, and then finds the maximum of these distances to get final product.Method of the present invention is only distinguished the sequencing that the user inserts, irrelevant with the specific code resource of its use, each time slot can independently carry out in the time of can distributing the skew of Midamble sign indicating number also can be interrelated, that is to say that can be respectively the user at uplink and downlink timeslot distributes the skew of Midamble sign indicating number, but also uplink and downlink timeslot only distributes a Midamble sign indicating number skew.
Set forth specific operation process of the present invention below, this process can separately or be respectively applied for uplink and downlink timeslot, specifically comprises:
Step a, the distance between all Midamble sign indicating number skews of computation-free state and all Midamble sign indicating number skews of seizure condition;
Step b finds out the Midamble sign indicating number skew of each idle condition and the minimum range that occupied Midamble sign indicating number is offset;
Step c picks out the maximum in the minimum range among the step b, and new access user is distributed in the corresponding Midamble sign indicating number skew of this distance.
Wherein, this step a further comprises:
Step a1 forms set A with n idle Midamble sign indicating number deviation number, and m occupied Midamble sign indicating number deviation number forms set B;
Step a2, the distance of all elements in all elements and the set B among the set of computations A, and form the set C of n*m, the delegation that wherein gathers C represents the distance of all elements in element in the set A and the set B;
Wherein, this step b further comprises:
Step b1 selects the minimum value of every row element among the above-mentioned set C to form the set D of n*1, as the distance of each element among the idle offset collection A to occupied offset collection B;
Wherein, this step c further comprises:
Step c1 selects the greatest member among the above-mentioned set D, as the ultimate range of the point in the idle offset collection to occupied offset collection;
Step c2 with the idle Midamble sign indicating number skew of above-mentioned greatest member correspondence, uses skew skew farthest to distribute to the user as distance, and the output allocation result.
The core concept of the method for the invention is to be offset for the user distributes the Midamble sign indicating number in proper order according to user's access, makes the skew that distributes all guarantee distance farthest, to avoid the phase mutual interference between different user.Because the Midamble sign indicating number of uplink and downlink timeslot skew assigning process is comparatively approaching, so we merge into same process with it.Following specific implementation method can be used for the upstream or downstream time slot separately, uses the allocation result of upstream or downstream time slot to distribute a Midamble sign indicating number skew as the user.Also can use simultaneously by uplink and downlink timeslot, for the user distributes two Midamble sign indicating number skews at up-downlink direction.
Below in conjunction with accompanying drawing enforcement of the present invention is described in further detail.
Fig. 1 is the flow chart of the specific Midamble sign indicating number assigning process of tdd communication systems UE of the present invention.As shown in Figure 1, comprising:
Step S101, the input user ID, and whether idle, suppose to have m idle the skew, the individual busy skew of n if identifying the state of each Midamble sign indicating number skew;
Step S102 with the set A of m idle Midamble sign indicating number formation 1 * m, forms n busy Midamble sign indicating number the set B of 1 * n;
Step S103, the set C of the distance formation n * m of each element in each element and the idle set B among the set of computations A; Concrete computational methods are gone into down: suppose total K skew, skew x with the distance of skew y should be: min{|x-y|, K-|x-y|}
Step S104 finds every set D that is listed as minimum element formation 1 * m among the set C;
Step S105, find set among the D maximum and the columns i in D;
Step S106 finds i idle skew in the set A, and it is distributed to the user;
Step S107 returns allocation result.
Illustrate the detailed process of distributing the skew of Midamble sign indicating number to the user below.This process can be applied to ascending time slot separately, and descending time slot distributes the skew of Midamble sign indicating number to the user no longer separately, and uses the sign indicating number skew identical with ascending time slot; Also can be applied to descending time slot separately, no longer otherwise allocated Midamble sign indicating number skew of ascending time slot, and use the sign indicating number skew identical with uplink and downlink timeslot; Can also be applied to uplink and downlink timeslot respectively, for the user distributes two Midamble sign indicating number skews.
Suppose that idle skew is 1,2,5,6,7,8 in total K=8 the Midamble sign indicating number skew, with its form 1 * 4 set A 1,2,5,6,7,8}, busy skew is 3,4, with the set B of its formation 1 * 23,4}.The set C that the distance of element forms in each element and the set B among the set of computations A:
Every column element is the distance of each element of set A and set B among the set C.The minimum value of every column element forms set D{2,1,1,2,3,3} among the set C.Find the greatest member 3 among the set D, and element 7 and 8 among the corresponding A; As can be seen, this hour offset 7 and 8 equates with the distance of skew 3,4, and is farthest.The two optional skew 7 moves and distributes to the user at it at last, returns allocation result: Midamnle sign indicating number skew 7.
Need to prove Midamble sign indicating number allocation model the dedicated channel that UE of the present invention is specific at all time slots except that time slot 0.Because the Midamble sign indicating number of each time slot skew number is relevant with the maximum number of user that time slot can carry, when therefore the skew of Midamble sign indicating number is distributed for the user in the crack at a time, need to guarantee that the number of users that this time slot has carried limits smaller or equal to time slot maximum user.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; being familiar with those of ordinary skill in the art ought can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (8)
1. the distribution method of the specific intermediate code of UE in the TDS-CDMA system, comprise: described system distributes the step of the specific intermediate code of UE for the new user who inserts at ascending time slot and/or descending time slot, it is characterized in that the step of the specific intermediate code of described distribution UE further comprises:
Step 1, the distance between specific intermediate code skew of each idle condition UE of described system-computed and the specific intermediate code skew of each seizure condition UE, described distance is the absolute value of the difference of two specific intermediate code deviation numbers of UE;
Step 2 determines that the specific intermediate code of each idle condition UE is offset the minimum range in the distance that is offset with the specific intermediate code of each seizure condition UE;
Step 3 in whole minimum range of the specific intermediate code correspondence of all idle condition UE, finds the specific intermediate code of the pairing idle condition UE of minimum range of numerical value maximum, gives the new user who inserts with the specific midamble allocation of described UE.
2. the distribution method of the specific intermediate code of UE is characterized in that in the TDS-CDMA system according to claim 1, further comprises before the described step 1:
Judge whether the number of users that described ascending time slot and/or descending time slot have carried is equal to or greater than described ascending time slot maximum number of user amount restriction, if, then terminate as described user and distribute the specific intermediate code of described UE, if not, then enter the step of described step 1.
3. the distribution method of the specific intermediate code of UE in the TDS-CDMA system according to claim 1, it is characterized in that described step 3 further comprises: described system beyond time slot 0 other ascending time slots and/or the dedicated channel of descending time slot be that described user distributes the specific intermediate code of UE.
4. the distribution method of the specific intermediate code of UE is characterized in that in the TDS-CDMA system according to claim 1, and described step 3 further comprises:
Described system only distributes the step of a specific intermediate code of UE for the new user who inserts at ascending time slot and descending time slot; Perhaps
Described system distributes a specific intermediate code of UE at described ascending time slot for the new user who inserts, and distributes the step of the specific intermediate code of another UE for the new user who inserts at described descending time slot.
5. the distribution method of the specific intermediate code of UE is characterized in that in the TDS-CDMA system according to claim 1, and described step 3 further comprises:
In identical time slot, described system assignment is given the step of the different specific intermediate code of UE of different user.
6. the distribution method of the specific intermediate code of UE is characterized in that in the TDS-CDMA system according to claim 1, and described step 3 further comprises:
In identical time slot, when many code channels of CU, described system assignment is given the step of a specific intermediate code of UE of described user.
7. the distribution method of the specific intermediate code of UE is characterized in that in the TDS-CDMA system according to claim 1, and described step 3 further comprises:
In different time-gap, described system assignment is given same user the step of the specific intermediate code of UE identical or inequality.
8. the distribution method of the specific intermediate code of UE is characterized in that in the TDS-CDMA system according to claim 1, further comprises before the described step 1:
The state that identifies the specific intermediate code skew of each UE is the idle condition or the step of seizure condition.
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| CN1327312A (en) * | 2000-06-07 | 2001-12-19 | 华为技术有限公司 | Forming method of training sequence in channel evaluation |
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| CN1327312A (en) * | 2000-06-07 | 2001-12-19 | 华为技术有限公司 | Forming method of training sequence in channel evaluation |
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